<!DOCTYPE html>
<html>
<title>View transitions: check pseudo element's default styles</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:vmpstr@chromium.org">

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<style>
div {
  width: 100px;
  height: 100px;
  background: blue;
  contain: paint;
  view-transition-name: target;
  mix-blend-mode: multiply;
  text-orientation: upright;
  color-scheme: dark light;
}
::view-transition-image-pair(target) {
  position: fixed;
}
</style>

<div id=target></div>

<script>
promise_test(() => {
  assert_implements(document.startViewTransition, "Missing document.startViewTransition");
  return new Promise(async (resolve, reject) => {
    let transition = document.startViewTransition(() => {
      assert_equals(getComputedStyle(document.documentElement, "::view-transition").position, "fixed", "::view-transition");
      assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(target)").position, "absolute", "container(target)");
      assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(target)").mixBlendMode, "multiply", "container(target)");
      assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(target)").textOrientation, "upright", "container(target)");
      assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(target)").colorScheme, "dark light", "container(target)");
      assert_equals(getComputedStyle(document.documentElement, "::view-transition-image-pair(target)").position, "absolute", "wrapper(target)");

      assert_equals(getComputedStyle(document.documentElement, "::view-transition-old(target)").position, "absolute", "outgoing(target)");

      assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(root)").position, "absolute", "container(root)");
      assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(root)").mixBlendMode, "normal", "container(root)");
      assert_equals(getComputedStyle(document.documentElement, "::view-transition-image-pair(root)").position, "absolute", "wrapper(root)");
      assert_equals(getComputedStyle(document.documentElement, "::view-transition-old(root)").position, "absolute", "outgoing(root)");

      requestAnimationFrame(() => {
        assert_equals(getComputedStyle(document.documentElement, "::view-transition").position, "fixed", "raf ::view-transition");
        assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(target)").position, "absolute", "raf container(target)");
        assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(target)").mixBlendMode, "multiply", "raf container(target)");
        assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(target)").textOrientation, "upright", "raf container(target)");
        assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(target)").colorScheme, "dark light", "raf container(target)");
        assert_equals(getComputedStyle(document.documentElement, "::view-transition-image-pair(target)").position, "fixed", "raf wrapper(target)");

        assert_equals(getComputedStyle(document.documentElement, "::view-transition-old(target)").position, "absolute", "raf outgoing(target)");

        assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(root)").position, "absolute", "raf container(root)");
        assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(root)").mixBlendMode, "normal", "raf container(root)");
        assert_equals(getComputedStyle(document.documentElement, "::view-transition-image-pair(root)").position, "absolute", "raf wrapper(root)");
        assert_equals(getComputedStyle(document.documentElement, "::view-transition-old(root)").position, "absolute", "raf outgoing(root)");
      });
    });
    await transition.finished;
    resolve();
  });
}, "position property of pseudo elements");

promise_test(() => {
  assert_implements(document.startViewTransition, "Missing document.startViewTransition");
  return new Promise(async (resolve, reject) => {
    let transition = document.startViewTransition(() => {
      assert_equals(getComputedStyle(document.documentElement, "::view-transition").position, "fixed");
      assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(target)").position, "absolute");
      assert_equals(getComputedStyle(document.documentElement, "::view-transition-image-pair(target)").position, "absolute");

      assert_equals(getComputedStyle(document.documentElement, "::view-transition-old(target)").position, "absolute");

      assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(root)").position, "absolute");
      assert_equals(getComputedStyle(document.documentElement, "::view-transition-image-pair(root)").position, "absolute");
      assert_equals(getComputedStyle(document.documentElement, "::view-transition-old(root)").position, "absolute");

      target.remove();
    });

    await transition.ready;

    assert_equals(getComputedStyle(document.documentElement, "::view-transition").position, "fixed");
    assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(target)").position, "absolute");
    assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(target)").mixBlendMode, "multiply");
    assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(target)").textOrientation, "upright");
    assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(target)").colorScheme, "dark light");
    assert_equals(getComputedStyle(document.documentElement, "::view-transition-image-pair(target)").position, "fixed");

    assert_equals(getComputedStyle(document.documentElement, "::view-transition-old(target)").position, "absolute");
    assert_equals(getComputedStyle(document.documentElement, "::view-transition-new(target)").position, "absolute");

    assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(root)").position, "absolute");
    assert_equals(getComputedStyle(document.documentElement, "::view-transition-image-pair(root)").position, "absolute");
    assert_equals(getComputedStyle(document.documentElement, "::view-transition-old(root)").position, "absolute");
    assert_equals(getComputedStyle(document.documentElement, "::view-transition-new(root)").position, "absolute");

    assert_equals(getComputedStyle(document.documentElement, "::view-transition-group(target)").position, "absolute");

    await transition.finished;

    // With custom ua sheets not applying to non-existing pseudo, the value should be the default (not absolute)
    assert_not_equals(getComputedStyle(document.documentElement, "::view-transition-group(target)").position, "absolute");

    resolve();
  });
}, "properties of pseudo elements outside of transition");
</script>
